From: "Jan E." <lists@...>
Date: 2012-11-01T05:03:19+09:00
Subject: Re: need regex to check for consonants and put number after each consonant

Hi,

this cannot work. First of all, to_num() is an instance method and not a 
class method. You cannot call it on Num, but you'd have to create an 
instance first and then call it on this object. Secondly, the method 
doesn't take a block, so the {|c| print c} is useless code. And the 
method itself also looks strange. You keep overwriting the "c" variable 
with completely different objects, I'm not even sure what will happen. 
And the regex syntax is wrong.

So you want to put a "0" after each consonant? Then simply use 
String#gsub:

str = 'Wow! Look at this get a number after each letter!'
puts str.gsub(/(?<=[bcdfghj-np-tvwxz])/i, '0')

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